Write a function expand(s1,s2) that expands shorthand
notations like a-z in the string s1 into the equivalent
complete list abc...xyz in s2 . Allow for letters of either
case and digits, and be prepared to handle cases like a-b-c
and a-z0-9 and -a-z.
z-a:zyx......ba
-1-6-:-123456-
1-9-1:123456789987654321
a-R-L:a-R...L
a-b-c:abbc
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